JP4189291B2 - Throw-away insert for grooving - Google Patents

Description

  The present invention relates to a throw-away tip used for cutting such as grooving of metal parts.

  Conventionally, as a throw-away tip used for cutting such as grooving of metal parts, a throw-away tip provided with a plurality of protrusions on a rake face as disclosed in Patent Document 1 is known (FIG. 5). reference.). In this throw-away tip, a pair of left and right projections are provided on the rake face in the vicinity of the main cutting edge, and the cross-section of the flat chip is narrowed down to a generally W shape by the action of the projections. By being deformed and divided, a good chip discharge property is exhibited, and the chip is discharged from the main cutting blade in the backward direction of the throw-away tip in principle. However, when the throwaway insert is attached to the holder with the main cutting edge tilted to the left or right due to deformation of the throwaway insert or variations in the mounting accuracy to the holder, chips are left and right of the main cutting edge. As a result, there is a problem that the discharge direction is biased to any of the above, and the discharge direction varies depending on changes in cutting conditions, such as the chip discharge direction is not constant and unstable. There was a problem that the chips hit the surface of the work material and the product was damaged.

In order to solve such a problem, in Patent Document 2, a plurality of protrusions on the rake face are unevenly distributed on either the left or right side of the main cutting edge to control chips generated in grooving in a specific direction. Thus, a throw-away tip that can be discharged is proposed (see FIG. 6).
JP-A-8-71807 JP 2000-176708 A

  However, in the throw-away tip in which the protrusions are unevenly distributed only on the left or right side of the main cutting edge as proposed in Patent Document 2, the chip discharging direction can be concentrated only in a certain direction in the grooving process. Although it is possible to achieve the effect of being able to do, in traverse processing that continuously feeds in grooving, there is only a protrusion on the side of one of the two cutting edges that will be the cutting edge during transverse feeding So, when traverse processing is performed using the side of the side cutting blade without the other protrusion, the chips are bent and stretched without being cut, and as a result, the chips are entangled with the work material and the holder, and the product is damaged, There was a problem of damaging the throw-away tip.

  In addition, the throw-away tip (see Fig. 7) in which the protrusions are arranged at different positions on the left and right sides of the main cutting edge uses a horizontal cutting edge whose protrusion is far from the main cutting edge. In traverse processing, if the depth of cut is small, the protrusions do not contribute to the chip treatment, so the chips are bent and stretched without being cut.As a result, the chips are entangled with the work material and the holder, and the product is There was a problem similar to the above-mentioned throw-away tip, such as hurting or damaging the throw-away tip.

  The present invention has been made in order to solve the above-described problems of the prior art, and in a grooving process including a traverse process, a throw-away chip capable of controlling a chip discharge direction and having a stable chip process. The purpose is to provide.

  In order to solve the above-mentioned problem, the throw-away tip of the present invention has a main cutting edge at the intersection ridge of the front relief surface on the front side of the tip of the cutting edge protrusion and the rake face on the upper surface, and the cutting edge protrusion. A throw-away tip formed by forming a horizontal cutting edge at the crossing edge of the side flank face and the rake face on both sides of the rake face, the position near the main cutting edge and the side cutting edge on the rake face Are provided with at least two protrusions of different sizes, and the rising position of the protrusion on the main cutting edge side is equidistant from the main cutting edge. According to such a configuration, in the grooving process, the chips generated by the main cutting edge are curved by hitting the protrusions having two different sizes, but since the force is more strongly applied from the large protrusions, the chips are removed from the large protrusion side. Since the chip is smoothly discharged to the small protrusion side, the chip discharge direction is fixed, and in the traverse processing after grooving, either the large or small protrusion is in the vicinity of the side cutting edge and the rising position on the main cutting edge side is the main position. By being provided at an equal distance from the cutting edge, the projections contribute to the chip processing regardless of the traverse direction, so that the chips are reliably curved and cut, and the chips are entangled with the work material and the holder. Absent. As a result, in grooving processing and traverse processing, stable processing can be performed without any product damage or throwaway tip damage due to chip disposal defects.

  Further, a breaker groove is formed continuously on the rake face to the main cutting edge, and a rake angle of the breaker groove is constant, and a distance (breaker width) between the main cutting edge and the breaker wall surface is large. Increasing from the side toward the small protrusion side is desirable in that the chip discharge direction during grooving can be reliably controlled and stabilized.

  In addition, it is desirable that the rake angle in the breaker groove increases as it goes from the large protrusion side to the small protrusion side in that the chip discharge direction during grooving can be reliably controlled and stabilized. .

  According to the throw-away tip of the present invention, in the grooving process, the chips generated by the main cutting edge are curved by hitting two different-sized protrusions, but since the force is applied more strongly from the large protrusions, the chips are Since the chip is smoothly discharged from the large protrusion side to the small protrusion side, the chip discharge direction is fixed, and in the traverse processing after grooving, either large or small protrusion is provided near the side cutting edge. The projections contribute to the chip treatment regardless of the traverse direction, so that the chips are surely bent and cut and the chips do not get tangled with the work material or the holder. As a result, in grooving processing and traverse processing, stable processing can be performed without any product damage or throwaway tip damage due to chip disposal defects.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 4 show an embodiment of the present invention. FIG. 1A is a plan view of a throw-away tip edge according to the first embodiment of the present invention, and FIG. FIG. 2 (a) is a side view of FIG. 1 (a), FIG. 2 (a) is a plan view of a throw-away tip edge according to the second embodiment, and FIG. FIG. 3A is a side view of FIG. 2A, FIG. 3A is a plan view of a throw-away tip edge according to the third embodiment, and FIG. FIG. 4A is a side view of FIG. 3A, FIG. 4A is a cross-sectional view taken along the line AA of FIG. 3A, and FIG. 4B is a side view of FIG. It is BB sectional drawing.

  First, referring to FIG. 1, a throw-away tip (hereinafter simply abbreviated as a tip) 1a according to a first embodiment of the present invention is a rake on the front flank 2 on the front side of the tip of the cutting blade protrusion 11 and on the upper surface side. A main cutting edge 4 is provided at a crossing ridge with the surface 3, and a horizontal cutting edge 6 is provided at a crossing ridge between the side relief surface 5 and the rake face 3 on both side surfaces of the cutting edge protrusion 11. And the position which becomes the vicinity of the said main cutting edge 4 of the said rake face 3 and the said horizontal cutting edge 6, ie, each corner | angular part where the main cutting edge 4 and the two horizontal cutting edges 6 cross, is mutually magnitude | size. Large projections 7 and small projections 8 are provided. When grooving is performed using the tip 1a having such a configuration, the chips generated by the main cutting edge 4 are greatly lifted on the large protrusion 7 side, and are bent and curled so as to be twisted to the small protrusion 8 side. As a result, the chip discharge direction is stabilized in one direction, and the chips do not get tangled with the work material or the holder.

  Next, traverse processing after grooving will be described. Here, the rising positions of the large protrusion 7 and the small protrusion 8 are both equidistant from the main cutting edge 4. Therefore, in the traverse processing after grooving, the chips can be lifted by the protrusions at the same position and curved and divided regardless of the lateral feed direction. That is, if the depth of cut is equal to or greater than a certain amount (d), the chips generated by the horizontal cutting blade 6 will be bent by hitting either the left or right projection, and a good chip treatment can be obtained regardless of the lateral feed direction. Will be.

  Further, in the chip 1b according to the second embodiment of the present invention, as shown in FIG. 2C, the breaker groove 9 is formed on the rake face 3 with a constant rake angle α. As shown in FIG. 2A, the distance (breaker width, w) between the main cutting edge 4 and the breaker wall surface 10 increases from the large protrusion 7 side toward the small protrusion 8 side. With this configuration, the chips generated by the main cutting edge 4 are greatly lifted on the large protrusion 7 side, curved so as to be twisted to the small protrusion 8 side, and are curled. However, the twist of the chips is insufficient. When the chip extends to the rear side of the rake face 3 in the state, the chip hits the breaker wall surface 10 formed so that the distance from the main cutting edge 4 increases from the large protrusion 7 side toward the small protrusion 8 side. Since it hits the breaker wall surface 10 on the large protrusion 7 side, the chips are lifted there, and the twisting of the chips and the discharge in a certain direction are promoted.

  Further, in the chip 1c according to the third embodiment of the present invention, the rake angle in the breaker groove 9 increases from the large protrusion 7 side toward the small protrusion 8 side. That is, as shown in FIG. 4, the rake angle in the AA cross section in FIG. 3A on the small protrusion 8 side is β, and the rake angle in the BB cross section in FIG. 3A on the large protrusion 7 side is γ. In this case, β> γ. At this time, since the rake angle is small and curved so as to clog chips, the large projection 7 side that can reduce the curl diameter has a larger chip bending and cutting effect by the rake surface 3. By the synergistic action of the rake face 3 and the large protrusion 7 whose rake angle gradually changes, the chip discharge direction in the grooving process can be controlled more reliably.

  As mentioned above, although embodiment of this invention was illustrated, this invention is not limited to embodiment mentioned above, It cannot be overemphasized that it can be made arbitrary, unless it deviates from the objective of invention. For example, the size of the large protrusion and the small protrusion may be different as long as at least one of the height, width, and length of the protrusion is different. Further, three or more protrusions may be provided, and in this case, the third protrusions other than the large protrusions and the small protrusions may exist at an intermediate position between the large protrusions and the small protrusions, or the large protrusions and the small protrusions. It may be arranged behind the protrusion.

  Sample No. 1 according to the first to third embodiments of the present invention described above. 1, no. 2, no. 3 were prepared with various dimensions shown in Table 1. As a comparative example, the conventional chip shape shown in FIGS. 4, no. 5, no. 6 were prepared with various dimensions as shown in Table 1. In addition, the blade width of the main cutting edge is 4 mm, and in the table, the size of the protrusions is the length of the large protrusion = 1.0 mm, the width = 0.8 mm, the height = 0.2 mm, and the length of the small protrusion = 0.6 mm, width = 0.4 mm, and height = 0.1 mm.

  About the obtained sample chip | tip, the outer diameter grooving process and the outer diameter traverse process were performed on the following conditions, and the chip disposal state was compared.

<Processing condition 1>
Machining form outer diameter grooving work material SCM415
Cutting speed V = 150m / min
Feed 0.2mm / rev
Cutting state The wet results are shown in Table 1.

<Processing condition 2>
Machining form Outer diameter traversing work material SCM415
Cutting speed V = 150m / min
Notch 2.0mm
Feed 0.2mm / rev
Cutting state The wet results are shown in Table 1.

  As is apparent from the results in Table 1, according to the present invention, at least two large protrusions or small protrusions having different sizes are provided in the vicinity of the main cutting edge on the rake face and in the vicinity of the two horizontal cutting edges. In addition, the sample No. 1 is shaped so that the rising position of the protrusion on the main cutting edge side is equidistant from the main cutting edge. In No. 1, in the grooving process, the chip discharge direction is stably discharged in a fixed direction, and in the traverse process in either the left or right direction, the protrusion contributes to the chip processing and the chip is bent and divided. It was. Further, the sample No. 1 has a shape in which the rake angle of the breaker groove formed on the rake face is constant and the distance between the main cutting edge and the breaker wall surface increases from the large protrusion side toward the small protrusion side. No. 2 and the sample No. 2 having a shape in which the rake angle α in the breaker groove increases from the large protrusion side to the small protrusion side. In No. 3, the chip discharge direction was easily determined in a certain direction in the grooving process, which was favorable.

  On the other hand, Sample No. which has a shape in which protrusions of the same size are arranged at the left and right positions of the conventional main cutting edge. In No. 4, the traverse processing showed good chip discharging performance, but the chip discharging direction was not determined in the grooving processing and was unstable. In addition, sample no. In No. 5, chips were extended by traverse processing using the side cutting blade having no protrusion, and the chip treatment was poor. In addition, although the protrusions are arranged on the left and right of the main cutting edge, the sample No. Even in No. 6, the protrusion did not contribute to the chip treatment in the traverse processing using the side cutting blade whose position is far from the main cutting edge, and the chip was extended.

It is (a) principal part top view, (b) front view, (c) side view of the throw away tip by 1st embodiment of this invention. It is the (a) principal part top view, (b) front view, (c) side view of the throw away tip by 2nd embodiment of this invention. It is (a) principal part top view, (b) front view, (c) side view of the throw away tip by 3rd embodiment of this invention. (A) It is AA sectional drawing of Fig.3 (a), (b) It is BB sectional drawing of Fig.3 (a). It is the (a) principal part top view, (b) front view, (c) side view of the conventional throw away tip. It is (a) principal part top view, (b) front view, (c) side view of another conventional throwaway tip. It is (a) principal part top view, (b) front view, (c) side view of another conventional throwaway tip.

Explanation of symbols

1a Throw away tip (first embodiment)
1b Throw away tip (second embodiment)
1c Throw-away tip (third embodiment)
2 Front flank 3 Rake face 4 Main cutting edge 5 Lateral flank face 6 Horizontal cutting edge 7 Large protrusion 8 Small protrusion 9 Breaker groove 10 Breaker wall surface 11 Cutting edge protrusion 21a Conventional throwaway tip 21b Another conventional throwaway tip 21c Another conventional throw-away tip 24 Main cutting edge 26 Horizontal cutting edge 27 Large protrusion 28 Small protrusion d Distance between main cutting edge and rising position of protrusion w, w _L , w _R Distance between main cutting edge and breaker wall surface (Breaker width)
α, β, γ Rake angle

Claims (3)

  The main cutting edge is located at the intersection ridge between the front flank on the front side of the front end of the cutting edge protrusion and the rake face on the upper surface side, and the cross ridge between the side flank and the rake face on both side faces of the cutting edge protrusion. In a throw-away tip formed with a horizontal cutting edge, a large projection and a small projection having different sizes are provided at two locations near the main cutting edge and in the vicinity of the two horizontal cutting edges on the rake face. The throw-away tip is characterized in that the rising position of the projection on the main cutting edge side is equidistant from the main cutting edge.   A breaker groove is continuously formed on the rake face to the main cutting edge, the rake angle of the breaker groove is constant, and the distance between the main cutting edge and the breaker wall surface is from the large protrusion side to the small protrusion side. The throw-away tip according to claim 1, wherein the throw-away tip becomes larger as it goes toward.   The throw-away tip according to claim 1, wherein a rake angle in the breaker groove increases from the large protrusion side toward the small protrusion side.

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